Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Revenue	$ 154,074		$ 147,284		$ 478,031		$ 428,498
Cost of revenue	70,997	[1]	64,506	[1]	217,495	[1]	188,432	[1]
Gross Profit	83,077		82,778		260,536		240,066
Operating expenses:
Research and development	29,068	[1]	29,473	[1]	90,194	[1]	85,850	[1]
Sales and marketing	30,329	[1]	30,137	[1]	93,480	[1]	88,036	[1]
General and administrative	12,775	[1]	14,095	[1]	36,831	[1]	40,550	[1]
Restructuring and other (Note 11)	2,280		604		4,530		2,316
Amortization of identified intangibles	4,619		2,311		13,434		8,720
Total operating expenses	79,071		76,620		238,469		225,472
Income from operations	4,006		6,158		22,067		14,594
Interest and other income, net	1,555		1,363		800		4,571
Income before income taxes	5,561		7,521		22,867		19,165
Benefit from (provision for) income taxes	7,850		(1,397)		3,783		(3,177)
Net income	$ 13,411		$ 6,124		$ 26,650		$ 15,988
Net income per basic common share	$ 0.29		$ 0.13		$ 0.57		$ 0.34
Net income per diluted common share	$ 0.28		$ 0.13		$ 0.56		$ 0.34
Shares used in basic per-share calculation	46,965		46,121		46,488		46,475
Shares used in diluted per-share calculation	48,009		47,307		47,670		47,701

[1] Includes stock-based compensation expense as follows: 2012 2011 2012 2011 Cost of revenue $ 293 $ 657 $ 826 $ 1,334 Research and development 1,365 1,245 4,189 4,013 Sales and marketing 790 1,027 2,404 3,086 General and administrative 2,457 2,358 6,919 9,130